Journal ArticleDOI
Short-term effects of biochar on soil heavy metal mobility are controlled by intra-particle diffusion and soil pH increase
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TLDR
In this paper, the effects of biochar on the mobility of metals in soils are investigated, focusing on a possible kinetic limitation by transport in biochar particles, the evolution of the biochar mineral phases, and the effect of bio char on soil pH.Abstract:
Summary
Biochar, the solid product of biomass pyrolysis, can be used as a soil amendment to stabilize metals in contaminated soils. The effects of biochar on the mobility of metals in soils are, however, poorly understood. To identify the predominant processes, we focused on (i) a possible kinetic limitation by transport in biochar particles, (ii) the evolution of biochar mineral phases and (iii) the effect of biochar on soil pH. Batch experiments were conducted to measure the sorption kinetics of copper (Cu), cadmium (Cd) and nickel (Ni) and the sorption-desorption isotherms for lead (Pb), Cu, Cd, zinc (Zn) and Ni in a wood-derived biochar. Sorption data were then compared with extraction test results using biochar with one acidic and one basic soil contaminated by Zn, Cd and Pb. Kinetic results showed that biochar particle sizes controlled metal sorption rate despite a similar specific surface area, which indicated a limitation by intra-particle diffusion. Isotherms showed a partially reversible sorption to biochar following the order Pb > Cu > Cd ≥ Zn > Ni, which we explained primarily by the (co)precipitation of metals or their adsorption on specific biochar mineral phases. Effective metal immobilization was observed with biochar in both contaminated soils but could not be predicted from the sorption isotherms. This immobilization appeared to be governed by the soil pH increase, which induced a greater retention of metals on soil particles. Short-term effects of biochar on contaminated soils may therefore be controlled by diffusion in biochar particles and by soil alkalinization processes.read more
Citations
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Biochar and metal-immobilizing Serratia liquefaciens CL-1 synergistically reduced metal accumulation in wheat grains in a metal-contaminated soil
TL;DR: It is suggested that biochar plus CL-1 reduced wheat grain metal uptake by reducing metal availability and translocation from the roots to grains and increasing pH levels, putrescine production, and aguA gene abundance, and they highlight the possibility of developing an effective technique for reducing the metal uptake of wheat grains using biocharplus metal-immobilizing bacteria in metal-contaminated soils.
Journal ArticleDOI
Effect of crop straw biochars on the remediation of Cd-contaminated farmland soil by hyperaccumulator Bidens pilosa L.
TL;DR: In this article, a pot experiment was carried out, where Bidens pilosa L. (B.pilosa) was as the tested plant and biochars (maize straw biochar and wheat straw fine biochar with two particle sizes) were as amendments.
Journal ArticleDOI
Response of soil microbial communities to additions of straw biochar, iron oxide, and iron oxide-modified straw biochar in an arsenic-contaminated soil.
Yu Zhang,Cancan Zhao,Chen Guoliang,Zhou Jianlin,Chen Zhang,Zhixian Li,Jiawen Zhu,Feng Tao,Chen Yuanqi +8 more
TL;DR: Results indicated that biochar and iron oxide–modified biochar affected soil microbial community composition by altering the soil C:N ratio, but iron oxide affected it via adjusting soil pH, which will help guide the development of remediation practices for As-contaminated soil using biochar.
Journal ArticleDOI
Physicochemical characteristics of biochars can be beneficially manipulated using post-pyrolyzed particle size modification.
TL;DR: This work aimed to study the changes in the physicochemical properties of biochars induced by post-pyrolyzed particle size processing, where size dependency was more influential on physical than chemical properties.
Journal ArticleDOI
Effects of pyrolysis temperature on production and physicochemical characterization of biochar derived from coconut fiber biomass through slow pyrolysis process
TL;DR: In this article, the authors investigated the competence of coconut fiber to produce biochar by slow pyrolysis process and analyzed the effects of different pyroplysis temperatures on the yield and physicochemical properties of biochars.
References
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Journal ArticleDOI
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Journal ArticleDOI
Adsorption of heavy metal ions on soils and soils constituents
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